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We took the back off a few weeks ago. Ran a multimeter over the the fuses. http://www.techlore.com/forum/thread/17103/Mitsubishi-WS-55809-Problems/?replyTo=16564#reply
They tested good. Pushed around on the heat sink. Whala, a real picture!! This worked for a few weeks. Then, back to the same old. So I took the back off again. Pushed on the heat sink (with a board of course) and we are back to a wonderful picture! Looks like we need to resolder the heat sink or convergence chips.
There are some pics towards the bottom of the thread listed below.
http://www.hometheaterspot.com/fusionbb/showtopic.php?tid/105109